Can't scale textures in Blender 2.81
I think the problem is that you're hooking up your nodes wrong because you've been misled by your white stucco texture.  Its base color is a nearly solid color, so scaling only the base color -- which is what you're doing in the GIF -- will have no noticeable effect.

I grabbed the base color and roughness maps for a white stucco texture from here, which I think are the same ones you're using in your GIF.  I applied them to the default cube using the following node network:



Note that the Vector output of the Mapping node is connected to both image textures.  The Texture Coordinate output should be connected to the Vector input of the Mapping node, leaving the Scale unconnected so you have the sliders available.

After that, scaling should work fine: